Consider the following methods: 1. Energy method 2. Equilibrium method 3. Rayleigh's method. Which of these methods can be used for determining the natural frequency of the free vibrations?

Consider the following methods: 1. Energy method 2. Equilibrium method

1.	Consider the following methods: 1. Energy method 2. Equilibrium method 3. Rayleigh's method. Which of these methods can be used for determining the natural frequency of the free vibrations?
A.	1 and 2
B.	1, 2 and 3
C.	1 and 3
D.	2 and 3
Answer» C. 1 and 3

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Consider the following methods: 1. Energy method 2. Equilibrium method 3. Rayleigh's method. Which of these methods can be used for determining the natural frequency of the free vibrations?

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